Colorimetric Determination of Trace Metals in Beer and in Brewing Materials Vii. Determination of Nickel

Abstract

Nickel is determined in the sulphuric acid residue remaining after the wet oxidation of a beer or brewing material. α‐furildioxime is added, and the resulting complex is extracted with chloroform. Any copper present is removed by shaking the extract with dilute sulphuric acid, and the yellow colour of the complex is measured photometrically.